Home / 128,436.35-177,235.04-71,836.79

Finding the Fourth Proportional to 128,436.35, 177,235.04 and 71,836.79

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Solution

The fourth proportional to 128,436.35, 177,235.04 and 71,836.79 is: 99,130.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,436.35 : 177,235.04 = 71,836.79 : x
  2. Step 2: Convert to fraction form
    128,436.35/177,235.04 = 71,836.79/x
  3. Step 3: Cross multiply
    128,436.35x = 177,235.04 × 71,836.79
  4. Step 4: Simplify right side
    128,436.35x = 12,731,995,989.94
  5. Step 5: Solve for x
    x = 12,731,995,989.94/128,436.35
  6. Step 6: Final answer
    x = 99,130.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.